Type IV – Adult Form
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Tremor of the hands and legs: There is no consensus as to when it is discovered, some researchers say it appears around the age of 10, while others speak around the age of 30. In this case, the motor loss is not very serious, neither the swallowing nor the respiratory system is very affected. Thus, milder symptoms such as tremors of the arms and legs are present, and life expectancy is normal. [6]
Conclusion
The diagnosis is not easy, and with the onset of symptoms, the doctor or pediatrician may suspect a series of diseases that affect the motor system, in addition to spinal muscular atrophy. For this reason, the doctor may order several tests to rule out other hypotheses, including electromyography, muscle biopsy and molecular analysis.
Reference:
[1] https://www.medicinenet.com/spinal_muscular_atrophy_sma/article.htm#what_is_spinal_muscular_atrophy
[2] https://www.webmd.com/a-to-z-guides/spinal-muscular-atrophy#1
[3] https://medlineplus.gov/genetics/condition/spinal-muscular-atrophy/
[4] https://medlineplus.gov/genetics/condition/spinal-muscular-atrophy/
[5] https://www.medicinenet.com/spinal_muscular_atrophy_sma/article.htm#what_are_the_types_and_symptoms_of_spinal_muscular_atrophy
[6] https://medlineplus.gov/genetics/condition/spinal-muscular-atrophy/